Question

目前正试图找到一个解决我现在的应用程序问题的解决方案。我想知道我是否可以更改以下代码以减少内存需求。现在，我有五种方法都可以做到以下几点，

-(void)createObstacle0 {
  int yMin = (CGRectGetMidY(self.frame)+190);
  int yMax = (CGRectGetMidY(self.frame)+270);
  CGPoint startPoint = CGPointMake(-20, yMin + arc4random_uniform(yMax - yMin));

  SKSpriteNode *obstacle = [SKSpriteNode spriteNodeWithImageNamed:@"obstacle"];
  obstacle.position = CGPointMake(startPoint.x, startPoint.y);
  obstacle.physicsBody = [SKPhysicsBody bodyWithCircleOfRadius:21.5];
  obstacle.physicsBody.categoryBitMask = enemyCategory;
  obstacle.physicsBody.contactTestBitMask = playerCategory;
  obstacle.physicsBody.dynamic = NO;
  obstacle.name = @"obstacle0";
  [self addChild:obstacle];

  [obstacle runAction:[SKAction moveTo:CGPointMake(340, startPoint.y) duration:minTime + arc4random_uniform(maxTime - minTime)]];
  float randomNum = arc4random_uniform(3.0) + 0.1;
  [self performSelector:@selector(createObstacle0) withObject:nil afterDelay:randomNum];
}

我尝试在我的.h文件中声明一个SKSpriteNode并让每个方法使用它而不是在它们内部声明的SKSpriteNode，但是我得到了上面的错误。有人可以告诉我如何更改我的代码，以便图像＆＃34;障碍＆＃34;只加载一次。

Answer 1

从你发布的代码中看来，你正在运行一个无休止的循环来创建障碍物对象。

尝试删除代码行[self performSelector:@selector(createObstacle0) withObject:nil afterDelay:randomNum];

添加这样的计时器功能：

- (void)startTimer
{
[NSTimer scheduledTimerWithTimeInterval:1
                                 target:self
                               selector:@selector(timerAction)
                               userInfo:nil
                                repeats:YES];
}

-(void)timerAction
{
    NSLog(@"do something");
}

您可以通过调用此startTimer

来启动[self startTimer];方法

您可以使用init方法或其他任何需要的方法执行此操作。

Answer 2

这里可能有点像“SpriteKit”这样的回答。您还可以将大量创建过程放入后台线程中的块中，然后在主线程中执行添加和操作，具体取决于应用程序中其他内容的强度。下面的例子的关键是它正在使用动作，并且序列有一个键。

-(void)createObstacleRepeatingMethod {

int yMin = (CGRectGetMidY(thingShowingObstacles.frame)+190);
int yMax = (CGRectGetMidY(thingShowingObstacles.frame)+270);

CGPoint startPoint = CGPointMake(-20, yMin + arc4random_uniform(yMax - yMin));
SKSpriteNode *obstacle = [SKSpriteNode spriteNodeWithImageNamed:@"obstacle"];

obstacle.position = CGPointMake(startPoint.x, startPoint.y);

obstacle.physicsBody = [SKPhysicsBody bodyWithCircleOfRadius:21.5];
obstacle.physicsBody.categoryBitMask = obstacleCategory;
obstacle.physicsBody.contactTestBitMask = playerCategory;
obstacle.physicsBody.dynamic = NO;
obstacle.name = @"obstacle0";

[thingShowingObstacles addChild:obstacle];
[obstacle runAction:[SKAction moveTo:CGPointMake(340, startPoint.y) duration:minTime + arc4random_uniform(maxTime - minTime)]];

SKAction *waitAction = [SKAction waitForDuration:1.5 withRange:1.4];
SKAction *callCreateObstacleAgain = [SKAction runBlock:^{
    [thingShowingObstacles createObstacleRepeatingMethod];
}];

SKAction *theSequenceForWaitThenCall = [SKAction sequence:@[waitAction, callCreateObstacleAgain]];

[thingShowingObstacles runAction:theSequenceForWaitThenCall withKey:@"createObstacleSequence"];

//the sequence having a key also ensures that there will only ever be one of the sequence actions running
//it also ensures that you have fine grained control over removing the action by calling
[thingShowingObstacles removeActionForKey:@"createObstacleSequence"]; }

尝试添加已拥有父级的SKNode

2 个答案: